vertex-ai-samples Resolve comments for Tensorboard notebooks

If you are opening a PR for Official Notebooks under the notebooks/official folder, follow this mandatory checklist:

[ ] Use the notebook template as a starting point.
[ ] Follow the style and grammar rules outlined in the above notebook template.
[ ] Verify the notebook runs successfully in Colab since the automated tests cannot guarantee this even when it passes.
[ ] Passes all the required automated checks. You can locally test for formatting and linting with these instructions.
[ ] You have consulted with a tech writer to see if tech writer review is necessary. If so, the notebook has been reviewed by a tech writer, and they have approved it.
[ ] This notebook has been added to the CODEOWNERS file under the Official Notebooks section, pointing to the author or the author's team.
[ ] The Jupyter notebook cleans up any artifacts it has created (datasets, ML models, endpoints, etc) so as not to eat up unnecessary resources.

If you are opening a PR for Community Notebooks under the notebooks/community folder:

[ ] This notebook has been added to the CODEOWNERS file under the Community Notebooks section, pointing to the author or the author's team.
[ ] Passes all the required formatting and linting checks. You can locally test with these instructions.

If you are opening a PR for Community Content under the community-content folder:

[ ] Make sure your main Content Directory Name is descriptive, informative, and includes some of the key products and attributes of your content, so that it is differentiable from other content
[ ] The main content directory has been added to the CODEOWNERS file under the Community Content section, pointing to the author or the author's team.
[ ] Passes all the required formatting and linting checks. You can locally test with these instructions.